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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - deriche: performance difference with -polly-position=before-vectorizer"
href="https://bugs.llvm.org/show_bug.cgi?id=34101">34101</a>
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<th>Summary</th>
<td>deriche: performance difference with -polly-position=before-vectorizer
</td>
</tr>
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<th>Product</th>
<td>Polly
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Optimizer
</td>
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
</td>
</tr>
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<th>Reporter</th>
<td>simbuerg@fim.uni-passau.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=18921" name="attach_18921" title="Preprocessed sources with reduced deriche kernel">attachment 18921</a> <a href="attachment.cgi?id=18921&action=edit" title="Preprocessed sources with reduced deriche kernel">[details]</a></span>
Preprocessed sources with reduced deriche kernel
Hi, using the (somewhat reduced) version of polybench's deriche kernel I get
the following two (weird) results when I compare Polly before the vectorizer to
its default position:
clang -mllvm -polly -mllvm -polly-position=before-vectorizer -O3 -I utilities
-I deriche -DPOLYBENCH_USE_C99_PROTO -DEXTRALARGE_DATASET
-DPOLYBENCH_USE_RESTRICT utilities/polybench.c deriche.dir/deriche.c -lm -o
./deriche.vect.bin
clang -mllvm -polly -O3 -I utilities -I deriche -DPOLYBENCH_USE_C99_PROTO
-DEXTRALARGE_DATASET -DPOLYBENCH_USE_RESTRICT utilities/polybench.c
deriche.dir/deriche.c -lm -o ./deriche.default.bin
/local/simbuerg/benchbuild/results/pj-test-deriche-33ef47b4-c3d5-4b39-8dc3-478aac1cbbcb
master* ⇣ simbuerg@ligeti 6s
❯ time ./deriche.vect.bin
./deriche.vect.bin 23.34s user 0.02s system 99% cpu 23.357 total
/local/simbuerg/benchbuild/results/pj-test-deriche-33ef47b4-c3d5-4b39-8dc3-478aac1cbbcb
master* ⇣ simbuerg@ligeti 23s
❯ time ./deriche.default.bin ./deriche.default.bin 0.13s user 0.00s
system 96% cpu 0.141 total
Expected result: The produced code should not get slower that without polly
:-).</pre>
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